static void Main(string[] args)

        {

            //建立连接

            var client = new MongoClient();

            //建立数据库

            var database = client.GetDatabase("TestDb");

            //建立collection

            var collection = database.GetCollection<BsonDocument>("foo");

            var document = new BsonDocument

            {

                {"name","MongoDB"},

                {"type","Database"},

                {"count",},

                {"info",new BsonDocument{{"x",},{"y",}}}

            };

            //插入数据

            collection.InsertOne(document);

            var count = collection.Count(document);

            Console.WriteLine(count);

            //查询数据

            var document1 = collection.Find(document);

            Console.WriteLine(document1.ToString());

            //更新数据

            var filter = Builders<BsonDocument>.Filter.Eq("name", "MongoDB");

            var update = Builders<BsonDocument>.Update.Set("name", "Ghazi");

            collection.UpdateMany(filter, update);

            //删除数据

            var filter1 = Builders<BsonDocument>.Filter.Eq("count", );

            collection.DeleteMany(filter1);

            BsonDocument document2 = new BsonDocument();

            document2.Add("name", "MongoDB");

            document2.Add("type", "Database");

            document2.Add("count", "");

            collection.InsertOne(document2);

            Console.Read();

        }